I?m getting Manifold Pressure Fluctuations with my IO-390 and G3X. I?ve replaced my sensor and it is better but still don?t have rock solid pressure. I also have one P-MAG with its normal rubber hose attached. I?ve seen a note somewhere that a restrictor fitting might help. Anyone have any specifics on what I?d need? Do others have this issue? I?ve checked for leaks and all seems good.